Perhaps they reacted to windshear, rather than stall.
Full back stick and TOGA, then hold both until the aircraft flies out of the problem.
I think that this is an excellent comment.
I know I'll be told that one can't get the sort of low level windshear that demands such aggressive response at altitude, but once the mindset has been made, and all sorts of confusing information is being thrown at one, then I can see the scenario that occurred being played out.
I'm glad I wasn't there.